Subtract 35/18 from 21/30
1st number: 21/30, 2nd number: 1 17/18
21/30 - 35/18 is -56/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
35/18 = 35 × 5/18 × 5 = 175/90 - Subtract the two like fractions:
63/90 - 175/90 = 63 - 175/90 = -112/90 - After reducing the fraction, the answer is -56/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-35/18 21/30-70/18 21/60-35/18 21/30-35/36 63/30-35/18 21/90-35/18 21/30-35/54 21/30-35/90